The Earth takes a year to orbit the sun. it is about 365 days. The exact time is 365.242199 days. To make years come out even, every four years there is a leap year. It has 366 days. The months on the calender are based on the phases of the moon. The Greeks has a 10 month calender. About 60 days were left over. So the Romans added two months. The idea of seven day weeks come from the HOLY BIBLE. The Romans named the days. We still use three of these names: Sunday ( Sun day), Monday (Moon day) ans Saturday ( Saturn day).
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